Why is the most damage to the brains of Huntington disease patients observed in the striatum?
a. The Rhes protein, needed for mutant huntingtin to become toxic, is only produced in the striatum.
b. The huntingtin gene is only expressed in the striatum.
c. The mutant huntingtin protein becomes toxic when bound to the Rhes protein, which is abundant in the
striatum.
d. Only the cells of the striatum contain the huntingtin mutation.
e. The CAG expansions are corrected in regions of the brain other than the striatum
c
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Which of the following statements best describes a herbaceous eudicot stem?
A. Vascular bundles are arranged in a ring which stores water and the products of photosynthesis. B. The stem is composed of primary and secondary tissues. C. Vascular bundles are scattered throughout the stem which is also capable of conducting photosynthesis. D. Vascular bundles are arranged in a ring and the cortex and pith are not distinguishable. E. Vascular bundles are arranged scattered throughout the stem which also stores water and the products of photosynthesis.
In the alternation of generations, what is formed when a spore germinates?
A) A haploid stage called the gametophyte. B) A plant that produces spores when mature. C) An increased number of spores. D) A haploid stage called the sporophyte. E) A plant that meiotically produces sex cells.
The ability of a pathogen to enter a cell, spread, and cause disease is termed
a. pathogenesis. b. invasion. c. colonization. d. adherence.
The complementary sequence to the DNA template 5'-ATACGCT-3' is 3'-TATGCGA-5'
Indicate whether the statement is true or false.